REngine is a general Java interface to R supporting multiple back-ends such as JRI and Rserve.
It allows Java code to evaluate R expressions, push and pull data. Since it is backend-agnostic, the same code can be used to embed R into a Java process or use a cluster of R servers to perform statisical computations.
The sources can be compiled simply by using
make
Maven is also supported (including unit tests) and can be run using make mvn.pkg. If you want to run mvn by hamd you can do so, but note that the Maven project requires a different directory structure which can be created by calling mkmvn.sh (unix only as it uses symlinks).
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